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<div id="overview"><a href="../../../../../../apidocs/org/inftel/tms/mobile/util/GingerbreadLastLocationFinder.html">View Javadoc</a></div><pre>

<a class="jxr_linenumber" name="1" href="#1">1</a>   <em class="jxr_comment">/*</em>
<a class="jxr_linenumber" name="2" href="#2">2</a>   <em class="jxr_comment"> * Copyright 2011 Google Inc.</em>
<a class="jxr_linenumber" name="3" href="#3">3</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="4" href="#4">4</a>   <em class="jxr_comment"> * Licensed under the Apache License, Version 2.0 (the "License");</em>
<a class="jxr_linenumber" name="5" href="#5">5</a>   <em class="jxr_comment"> * you may not use this file except in compliance with the License.</em>
<a class="jxr_linenumber" name="6" href="#6">6</a>   <em class="jxr_comment"> * You may obtain a copy of the License at</em>
<a class="jxr_linenumber" name="7" href="#7">7</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="8" href="#8">8</a>   <em class="jxr_comment"> *      <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a class="jxr_linenumber" name="9" href="#9">9</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="10" href="#10">10</a>  <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing, software</em>
<a class="jxr_linenumber" name="11" href="#11">11</a>  <em class="jxr_comment"> * distributed under the License is distributed on an "AS IS" BASIS,</em>
<a class="jxr_linenumber" name="12" href="#12">12</a>  <em class="jxr_comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</em>
<a class="jxr_linenumber" name="13" href="#13">13</a>  <em class="jxr_comment"> * See the License for the specific language governing permissions and</em>
<a class="jxr_linenumber" name="14" href="#14">14</a>  <em class="jxr_comment"> * limitations under the License.</em>
<a class="jxr_linenumber" name="15" href="#15">15</a>  <em class="jxr_comment"> */</em>
<a class="jxr_linenumber" name="16" href="#16">16</a>  
<a class="jxr_linenumber" name="17" href="#17">17</a>  <strong class="jxr_keyword">package</strong> org.inftel.tms.mobile.util;
<a class="jxr_linenumber" name="18" href="#18">18</a>  
<a class="jxr_linenumber" name="19" href="#19">19</a>  <strong class="jxr_keyword">import</strong> java.util.List;
<a class="jxr_linenumber" name="20" href="#20">20</a>  
<a class="jxr_linenumber" name="21" href="#21">21</a>  <strong class="jxr_keyword">import</strong> org.inftel.tms.mobile.util.base.ILastLocationFinder;
<a class="jxr_linenumber" name="22" href="#22">22</a>  
<a class="jxr_linenumber" name="23" href="#23">23</a>  <strong class="jxr_keyword">import</strong> android.app.PendingIntent;
<a class="jxr_linenumber" name="24" href="#24">24</a>  <strong class="jxr_keyword">import</strong> android.content.BroadcastReceiver;
<a class="jxr_linenumber" name="25" href="#25">25</a>  <strong class="jxr_keyword">import</strong> android.content.Context;
<a class="jxr_linenumber" name="26" href="#26">26</a>  <strong class="jxr_keyword">import</strong> android.content.Intent;
<a class="jxr_linenumber" name="27" href="#27">27</a>  <strong class="jxr_keyword">import</strong> android.content.IntentFilter;
<a class="jxr_linenumber" name="28" href="#28">28</a>  <strong class="jxr_keyword">import</strong> android.location.Criteria;
<a class="jxr_linenumber" name="29" href="#29">29</a>  <strong class="jxr_keyword">import</strong> android.location.Location;
<a class="jxr_linenumber" name="30" href="#30">30</a>  <strong class="jxr_keyword">import</strong> android.location.LocationListener;
<a class="jxr_linenumber" name="31" href="#31">31</a>  <strong class="jxr_keyword">import</strong> android.location.LocationManager;
<a class="jxr_linenumber" name="32" href="#32">32</a>  
<a class="jxr_linenumber" name="33" href="#33">33</a>  <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="34" href="#34">34</a>  <em class="jxr_javadoccomment"> * Optimized implementation of Last Location Finder for devices running Gingerbread and above.</em>
<a class="jxr_linenumber" name="35" href="#35">35</a>  <em class="jxr_javadoccomment"> * </em>
<a class="jxr_linenumber" name="36" href="#36">36</a>  <em class="jxr_javadoccomment"> * This class let's you find the "best" (most accurate and timely) previously detected location</em>
<a class="jxr_linenumber" name="37" href="#37">37</a>  <em class="jxr_javadoccomment"> * using whatever providers are available.</em>
<a class="jxr_linenumber" name="38" href="#38">38</a>  <em class="jxr_javadoccomment"> * </em>
<a class="jxr_linenumber" name="39" href="#39">39</a>  <em class="jxr_javadoccomment"> * Where a timely / accurate previous location is not detected it will return the newest location</em>
<a class="jxr_linenumber" name="40" href="#40">40</a>  <em class="jxr_javadoccomment"> * (where one exists) and setup a oneshot location update to find the current location.</em>
<a class="jxr_linenumber" name="41" href="#41">41</a>  <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="42" href="#42">42</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../org/inftel/tms/mobile/util/GingerbreadLastLocationFinder.html">GingerbreadLastLocationFinder</a> <strong class="jxr_keyword">implements</strong> <a href="../../../../../org/inftel/tms/mobile/util/base/ILastLocationFinder.html">ILastLocationFinder</a> {
<a class="jxr_linenumber" name="43" href="#43">43</a>  
<a class="jxr_linenumber" name="44" href="#44">44</a>  	<strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">static</strong> String TAG = <span class="jxr_string">"LastLocationFinder"</span>;
<a class="jxr_linenumber" name="45" href="#45">45</a>  	<strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">static</strong> String SINGLE_LOCATION_UPDATE_ACTION = <span class="jxr_string">"com.radioactiveyak.places.SINGLE_LOCATION_UPDATE_ACTION"</span>;
<a class="jxr_linenumber" name="46" href="#46">46</a>  
<a class="jxr_linenumber" name="47" href="#47">47</a>  	<strong class="jxr_keyword">protected</strong> PendingIntent singleUpatePI;
<a class="jxr_linenumber" name="48" href="#48">48</a>  	<strong class="jxr_keyword">protected</strong> LocationListener locationListener;
<a class="jxr_linenumber" name="49" href="#49">49</a>  	<strong class="jxr_keyword">protected</strong> LocationManager locationManager;
<a class="jxr_linenumber" name="50" href="#50">50</a>  	<strong class="jxr_keyword">protected</strong> Context context;
<a class="jxr_linenumber" name="51" href="#51">51</a>  	<strong class="jxr_keyword">protected</strong> Criteria criteria;
<a class="jxr_linenumber" name="52" href="#52">52</a>  
<a class="jxr_linenumber" name="53" href="#53">53</a>  	<em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="54" href="#54">54</a>  <em class="jxr_javadoccomment">	 * Construct a new Gingerbread Last Location Finder.</em>
<a class="jxr_linenumber" name="55" href="#55">55</a>  <em class="jxr_javadoccomment">	 * @param context Context</em>
<a class="jxr_linenumber" name="56" href="#56">56</a>  <em class="jxr_javadoccomment">	 */</em>
<a class="jxr_linenumber" name="57" href="#57">57</a>  	<strong class="jxr_keyword">public</strong> <a href="../../../../../org/inftel/tms/mobile/util/GingerbreadLastLocationFinder.html">GingerbreadLastLocationFinder</a>(Context context) {
<a class="jxr_linenumber" name="58" href="#58">58</a>  		<strong class="jxr_keyword">this</strong>.context = context;
<a class="jxr_linenumber" name="59" href="#59">59</a>  		locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
<a class="jxr_linenumber" name="60" href="#60">60</a>  		<em class="jxr_comment">// Coarse accuracy is specified here to get the fastest possible result.</em>
<a class="jxr_linenumber" name="61" href="#61">61</a>  		<em class="jxr_comment">// The calling Activity will likely (or have already) request ongoing</em>
<a class="jxr_linenumber" name="62" href="#62">62</a>  		<em class="jxr_comment">// updates using the Fine location provider.</em>
<a class="jxr_linenumber" name="63" href="#63">63</a>  		criteria = <strong class="jxr_keyword">new</strong> Criteria();
<a class="jxr_linenumber" name="64" href="#64">64</a>  		criteria.setAccuracy(Criteria.ACCURACY_LOW);
<a class="jxr_linenumber" name="65" href="#65">65</a>  
<a class="jxr_linenumber" name="66" href="#66">66</a>  		<em class="jxr_comment">// Construct the Pending Intent that will be broadcast by the oneshot</em>
<a class="jxr_linenumber" name="67" href="#67">67</a>  		<em class="jxr_comment">// location update.</em>
<a class="jxr_linenumber" name="68" href="#68">68</a>  		Intent updateIntent = <strong class="jxr_keyword">new</strong> Intent(SINGLE_LOCATION_UPDATE_ACTION);
<a class="jxr_linenumber" name="69" href="#69">69</a>  		singleUpatePI = PendingIntent.getBroadcast(context, 0, updateIntent,
<a class="jxr_linenumber" name="70" href="#70">70</a>  				PendingIntent.FLAG_UPDATE_CURRENT);
<a class="jxr_linenumber" name="71" href="#71">71</a>  	}
<a class="jxr_linenumber" name="72" href="#72">72</a>  
<a class="jxr_linenumber" name="73" href="#73">73</a>  	<em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="74" href="#74">74</a>  <em class="jxr_javadoccomment">	 * Returns the most accurate and timely previously detected location. Where the last result is</em>
<a class="jxr_linenumber" name="75" href="#75">75</a>  <em class="jxr_javadoccomment">	 * beyond the specified maximum distance or latency a one-off location update is returned via</em>
<a class="jxr_linenumber" name="76" href="#76">76</a>  <em class="jxr_javadoccomment">	 * the {@link LocationListener} specified in {@link setChangedLocationListener}.</em>
<a class="jxr_linenumber" name="77" href="#77">77</a>  <em class="jxr_javadoccomment">	 * @param minDistance Minimum distance before we require a location update.</em>
<a class="jxr_linenumber" name="78" href="#78">78</a>  <em class="jxr_javadoccomment">	 * @param minTime Minimum time required between location updates.</em>
<a class="jxr_linenumber" name="79" href="#79">79</a>  <em class="jxr_javadoccomment">	 * @return The most accurate and / or timely previously detected location.</em>
<a class="jxr_linenumber" name="80" href="#80">80</a>  <em class="jxr_javadoccomment">	 */</em>
<a class="jxr_linenumber" name="81" href="#81">81</a>  	<strong class="jxr_keyword">public</strong> Location getLastBestLocation(<strong class="jxr_keyword">int</strong> minDistance, <strong class="jxr_keyword">long</strong> minTime) {
<a class="jxr_linenumber" name="82" href="#82">82</a>  		Location bestResult = <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="83" href="#83">83</a>  		<strong class="jxr_keyword">float</strong> bestAccuracy = Float.MAX_VALUE;
<a class="jxr_linenumber" name="84" href="#84">84</a>  		<strong class="jxr_keyword">long</strong> bestTime = Long.MIN_VALUE;
<a class="jxr_linenumber" name="85" href="#85">85</a>  
<a class="jxr_linenumber" name="86" href="#86">86</a>  		<em class="jxr_comment">// Iterate through all the providers on the system, keeping</em>
<a class="jxr_linenumber" name="87" href="#87">87</a>  		<em class="jxr_comment">// note of the most accurate result within the acceptable time limit.</em>
<a class="jxr_linenumber" name="88" href="#88">88</a>  		<em class="jxr_comment">// If no result is found within maxTime, return the newest Location.</em>
<a class="jxr_linenumber" name="89" href="#89">89</a>  		List&lt;String&gt; matchingProviders = locationManager.getAllProviders();
<a class="jxr_linenumber" name="90" href="#90">90</a>  		<strong class="jxr_keyword">for</strong> (String provider : matchingProviders) {
<a class="jxr_linenumber" name="91" href="#91">91</a>  			Location location = locationManager.getLastKnownLocation(provider);
<a class="jxr_linenumber" name="92" href="#92">92</a>  			<strong class="jxr_keyword">if</strong> (location != <strong class="jxr_keyword">null</strong>) {
<a class="jxr_linenumber" name="93" href="#93">93</a>  				<strong class="jxr_keyword">float</strong> accuracy = location.getAccuracy();
<a class="jxr_linenumber" name="94" href="#94">94</a>  				<strong class="jxr_keyword">long</strong> time = location.getTime();
<a class="jxr_linenumber" name="95" href="#95">95</a>  
<a class="jxr_linenumber" name="96" href="#96">96</a>  				<strong class="jxr_keyword">if</strong> ((time &gt; minTime &amp;&amp; accuracy &lt; bestAccuracy)) {
<a class="jxr_linenumber" name="97" href="#97">97</a>  					bestResult = location;
<a class="jxr_linenumber" name="98" href="#98">98</a>  					bestAccuracy = accuracy;
<a class="jxr_linenumber" name="99" href="#99">99</a>  					bestTime = time;
<a class="jxr_linenumber" name="100" href="#100">100</a> 				} <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (time &lt; minTime &amp;&amp; bestAccuracy == Float.MAX_VALUE &amp;&amp; time &gt; bestTime) {
<a class="jxr_linenumber" name="101" href="#101">101</a> 					bestResult = location;
<a class="jxr_linenumber" name="102" href="#102">102</a> 					bestTime = time;
<a class="jxr_linenumber" name="103" href="#103">103</a> 				}
<a class="jxr_linenumber" name="104" href="#104">104</a> 			}
<a class="jxr_linenumber" name="105" href="#105">105</a> 		}
<a class="jxr_linenumber" name="106" href="#106">106</a> 
<a class="jxr_linenumber" name="107" href="#107">107</a> 		<em class="jxr_comment">// If the best result is beyond the allowed time limit, or the accuracy of the</em>
<a class="jxr_linenumber" name="108" href="#108">108</a> 		<em class="jxr_comment">// best result is wider than the acceptable maximum distance, request a single update.</em>
<a class="jxr_linenumber" name="109" href="#109">109</a> 		<em class="jxr_comment">// This check simply implements the same conditions we set when requesting regular</em>
<a class="jxr_linenumber" name="110" href="#110">110</a> 		<em class="jxr_comment">// location updates every [minTime] and [minDistance].</em>
<a class="jxr_linenumber" name="111" href="#111">111</a> 		<strong class="jxr_keyword">if</strong> (locationListener != <strong class="jxr_keyword">null</strong> &amp;&amp; (bestTime &lt; minTime || bestAccuracy &gt; minDistance)) {
<a class="jxr_linenumber" name="112" href="#112">112</a> 			IntentFilter locIntentFilter = <strong class="jxr_keyword">new</strong> IntentFilter(SINGLE_LOCATION_UPDATE_ACTION);
<a class="jxr_linenumber" name="113" href="#113">113</a> 			context.registerReceiver(singleUpdateReceiver, locIntentFilter);
<a class="jxr_linenumber" name="114" href="#114">114</a> 			locationManager.requestSingleUpdate(criteria, singleUpatePI);
<a class="jxr_linenumber" name="115" href="#115">115</a> 		}
<a class="jxr_linenumber" name="116" href="#116">116</a> 
<a class="jxr_linenumber" name="117" href="#117">117</a> 		<strong class="jxr_keyword">return</strong> bestResult;
<a class="jxr_linenumber" name="118" href="#118">118</a> 	}
<a class="jxr_linenumber" name="119" href="#119">119</a> 
<a class="jxr_linenumber" name="120" href="#120">120</a> 	<em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="121" href="#121">121</a> <em class="jxr_javadoccomment">	 * This {@link BroadcastReceiver} listens for a single location update before unregistering</em>
<a class="jxr_linenumber" name="122" href="#122">122</a> <em class="jxr_javadoccomment">	 * itself. The oneshot location update is returned via the {@link LocationListener} specified in</em>
<a class="jxr_linenumber" name="123" href="#123">123</a> <em class="jxr_javadoccomment">	 * {@link setChangedLocationListener}.</em>
<a class="jxr_linenumber" name="124" href="#124">124</a> <em class="jxr_javadoccomment">	 */</em>
<a class="jxr_linenumber" name="125" href="#125">125</a> 	<strong class="jxr_keyword">protected</strong> BroadcastReceiver singleUpdateReceiver = <strong class="jxr_keyword">new</strong> BroadcastReceiver() {
<a class="jxr_linenumber" name="126" href="#126">126</a> 		@Override
<a class="jxr_linenumber" name="127" href="#127">127</a> 		<strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> onReceive(Context context, Intent intent) {
<a class="jxr_linenumber" name="128" href="#128">128</a> 			context.unregisterReceiver(singleUpdateReceiver);
<a class="jxr_linenumber" name="129" href="#129">129</a> 
<a class="jxr_linenumber" name="130" href="#130">130</a> 			String key = LocationManager.KEY_LOCATION_CHANGED;
<a class="jxr_linenumber" name="131" href="#131">131</a> 			Location location = (Location) intent.getExtras().get(key);
<a class="jxr_linenumber" name="132" href="#132">132</a> 
<a class="jxr_linenumber" name="133" href="#133">133</a> 			<strong class="jxr_keyword">if</strong> (locationListener != <strong class="jxr_keyword">null</strong> &amp;&amp; location != <strong class="jxr_keyword">null</strong>)
<a class="jxr_linenumber" name="134" href="#134">134</a> 				locationListener.onLocationChanged(location);
<a class="jxr_linenumber" name="135" href="#135">135</a> 
<a class="jxr_linenumber" name="136" href="#136">136</a> 			locationManager.removeUpdates(singleUpatePI);
<a class="jxr_linenumber" name="137" href="#137">137</a> 		}
<a class="jxr_linenumber" name="138" href="#138">138</a> 	};
<a class="jxr_linenumber" name="139" href="#139">139</a> 
<a class="jxr_linenumber" name="140" href="#140">140</a> 	<em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="141" href="#141">141</a> <em class="jxr_javadoccomment">	 * {@inheritDoc}</em>
<a class="jxr_linenumber" name="142" href="#142">142</a> <em class="jxr_javadoccomment">	 */</em>
<a class="jxr_linenumber" name="143" href="#143">143</a> 	<strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> setChangedLocationListener(LocationListener l) {
<a class="jxr_linenumber" name="144" href="#144">144</a> 		locationListener = l;
<a class="jxr_linenumber" name="145" href="#145">145</a> 	}
<a class="jxr_linenumber" name="146" href="#146">146</a> 
<a class="jxr_linenumber" name="147" href="#147">147</a> 	<em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="148" href="#148">148</a> <em class="jxr_javadoccomment">	 * {@inheritDoc}</em>
<a class="jxr_linenumber" name="149" href="#149">149</a> <em class="jxr_javadoccomment">	 */</em>
<a class="jxr_linenumber" name="150" href="#150">150</a> 	<strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> cancel() {
<a class="jxr_linenumber" name="151" href="#151">151</a> 		locationManager.removeUpdates(singleUpatePI);
<a class="jxr_linenumber" name="152" href="#152">152</a> 	}
<a class="jxr_linenumber" name="153" href="#153">153</a> }
</pre>
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